JP4725610B2 - Power transmission control device, power transmission device, power reception control device, power reception device, and electronic device - Google Patents

Power transmission control device, power transmission device, power reception control device, power reception device, and electronic device Download PDF

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JP4725610B2
JP4725610B2 JP2008185396A JP2008185396A JP4725610B2 JP 4725610 B2 JP4725610 B2 JP 4725610B2 JP 2008185396 A JP2008185396 A JP 2008185396A JP 2008185396 A JP2008185396 A JP 2008185396A JP 4725610 B2 JP4725610 B2 JP 4725610B2
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power transmission
power
command
host
register
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JP2010028932A (en
Inventor
貴宏 上條
健太郎 依田
伸敬 塩崎
幸太 大西
正之 神山
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セイコーエプソン株式会社
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/60Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/022Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters characterised by the type of converter
    • H02J7/025Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters characterised by the type of converter using non-contact coupling, e.g. inductive, capacitive
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14Inductive couplings
    • H01F2038/143Inductive couplings for signals
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T307/00Electrical transmission or interconnection systems
    • Y10T307/74Switching systems
    • Y10T307/937Switch actuation
    • Y10T307/944Power circuit controlled

Description

  The present invention relates to a power transmission control device, a power transmission device, a power reception control device, a power reception device, an electronic device, and the like.

  In recent years, contactless power transmission (contactless power transmission) that uses electromagnetic induction and enables power transmission even without a metal part contact has been highlighted. Charging of telephones and household equipment (for example, a handset of a telephone) has been proposed.

  There exists patent document 1 as a prior art of such non-contact electric power transmission. In Patent Document 1, ID authentication is realized by transmitting and receiving an authentication code between a power transmission side (primary side) and a power reception side (secondary side), and insertion of a foreign object or the like is detected.

However, in the prior art of Patent Document 1, the authentication code is communicated in order to realize proper contactless power transmission between the power transmission side and the power reception side, but the application level higher than that is used. No data communication was expected in Japan. For this reason, for example, data communication between the power transmission side host and the power reception side host cannot be performed by effectively utilizing the charging period of the electronic device.
JP 2006-60909 A

  According to some aspects of the present invention, it is possible to provide a power transmission control device, a power transmission device, a power reception control device, a power reception device, and an electronic apparatus that can realize appropriate data communication between the power transmission side host and the power reception side host.

  The present invention relates to the non-contact power transmission system in which a primary coil and a secondary coil are electromagnetically coupled to transmit power from a power transmission device to a power reception device and supply power to a load of the power reception device. A power transmission control device provided in a power transmission device, a control unit that controls the power transmission control device, a host interface for communicating with a power transmission side host, and the power transmission side host accessible via the host interface A communication request command for requesting communication between the power transmission side host and the power reception side host is written to the register unit by the power transmission side host via the host interface. The communication request command is transmitted to the communication mode in which communication is performed between the power transmission side host and the power reception side host. It related to the power transmission control device transmitting device.

  According to the present invention, the host interface for communicating with the power transmission side host and the register unit accessible by the power transmission side host via the host interface are provided. When the communication request command is written to the register unit by the power transmission side host via the host interface, the communication request command is transmitted to the power receiving apparatus while the mode is shifted to the communication mode in which communication between hosts is performed. In this way, it is possible to realize appropriate data communication between the power transmission side host and the power reception side host by effectively utilizing contactless power transmission.

  In the present invention, the control unit may accept a communication request by the communication request command after an authentication process between the power transmission device and the power reception device is completed and normal power transmission is started.

  In this way, the authentication process is completed, and the communication request can be accepted after the power receiving side is appropriate or the compatibility between the power transmitting side and the power receiving side is confirmed, so proper data communication is realized. it can.

  In the present invention, the register unit includes a command register to which a command issued by the power transmission side host is written, and a data register for buffering data, and the control unit receives the power reception side from the power transmission side host. When an OUT transfer command requesting data transfer to the host is written in the command register, the OUT transfer command is transmitted to the power receiving device, and then a data transfer command instructing data transfer is sent to the command register. When the data is written and the data is written to the data register, the data transfer command and the data may be transmitted to the power receiving apparatus.

  In this way, the power transmission side host writes the OUT transfer command to the register unit, thereby shifting to the communication mode and executing OUT transfer for transferring data from the power transmission side host to the power reception side host.

  In the present invention, the register unit includes a command register to which a command issued by the power transmission side host is written, and a data register for buffering data, and the control unit is configured to transmit data from the power reception side host to the power transmission side. When an IN transfer command for requesting data transfer to the host is written in the command register, the IN transfer command is transmitted to the power receiving device, and then the data transfer command instructing data transfer from the power receiving device When the data is received, the received data may be written into the data register.

  In this way, when the power transmission side host writes the IN transfer command to the register unit, the communication mode is entered, and IN transfer for transferring data from the power reception side host to the power transmission side host is executed.

  In the present invention, when the control unit shifts to the communication mode, at least one of a transmission condition for contactless power transmission and a communication condition between the power transmission device and the power reception device is set as a condition for normal power transmission. Different communication mode conditions may be set.

  In this way, since the transmission conditions and communication conditions for the communication mode can be set separately from the transmission conditions and communication conditions for normal power transmission, the communication reliability and the like can be improved.

  The present invention also relates to a non-contact power transmission system that electromagnetically couples a primary coil and a secondary coil to transmit power from a power transmitting device to a power receiving device and supply power to a load of the power receiving device. A power transmission control device provided in the power transmission device, the control unit performing control processing of the power transmission control device, a host interface for communicating with a power transmission side host, and the power transmission side host accessing via the host interface A register unit capable of transmitting, when the control unit shifts to a communication mode in which communication is performed between the power transmission side host and the power reception side host, transmission conditions for contactless power transmission, the power transmission device, and the power reception The present invention relates to a power transmission control device that sets at least one of communication conditions with a device as a condition for a communication mode different from a condition for normal power transmission.

  According to the present invention, the host interface for communicating with the power transmission side host and the register unit accessible by the power transmission side host via the host interface are provided. When the communication mode is entered, the transmission conditions and communication conditions for contactless power transmission are set to the transmission conditions and communication conditions for the communication mode. This makes it possible to set the transmission conditions and communication conditions for the communication mode separately from the transmission conditions and communication conditions for normal power transmission, thereby improving communication reliability and the like.

  In the present invention, the control unit may switch the driving frequency or driving voltage of the primary coil to the driving frequency or driving voltage for the communication mode when transitioning to the communication mode.

  In this way, the drive frequency and drive voltage of the primary coil can be set to the optimum frequency and voltage for communication during the communication mode.

  In the present invention, the register unit may include a status register, and the status register may include a bit for the power transmission side host to confirm a power transmission state of contactless power transmission.

  If it does in this way, the power transmission side host will be able to confirm the power transmission state of non-contact power transmission by effectively utilizing the register part provided for communication between hosts.

  In the present invention, the load may include a battery, and the status register may include a bit for the power transmission side host to confirm a charge state of the battery.

  In this way, the power transmission side host can check the state of charge of the battery by effectively utilizing the register unit provided for the communication between the hosts.

  In the present invention, the register unit includes an interrupt register, and the interrupt register has a bit for notifying the power transmission side host of reception of a command when the command issued by the power reception side host is received. May be.

  In this way, the power transmission side host can perform other processes until a command reception notification is received, so that the processing load on the power transmission side host can be reduced.

  In the present invention, the load may include a battery, and the interrupt register may include a bit for notifying the power transmission side host of the start of charging of the battery.

  In this way, the power transmission side host can grasp the timing of starting charging, and can realize more intelligent processing.

  In the present invention, the control unit may shift to the communication mode when receiving an interrupt command for a communication request issued by the power receiving host.

  In this way, it is possible to shift to the communication mode even in response to a communication request from the power receiving host.

  The present invention also relates to a power transmission device including any of the power transmission control devices described above and a power transmission unit that generates an alternating voltage and supplies the alternating voltage to the primary coil.

  Moreover, this invention relates to the electronic device containing the power transmission apparatus as described above.

  The present invention also relates to a non-contact power transmission system that electromagnetically couples a primary coil and a secondary coil to transmit power from a power transmitting device to a power receiving device and supply power to a load of the power receiving device. A power reception control device provided in the power reception device, the control unit for controlling the power reception control device, a host interface for communicating with the power reception side host, and the power reception side host accessible via the host interface The control unit, when receiving a communication request command for requesting communication between the power transmission side host and the power reception side host from the power transmission device, the power transmission side host and the power reception side. This relates to a power reception control device that shifts to a communication mode in which communication is performed with the host on the side.

  According to the present invention, a host interface for communicating with a power receiving host and a register unit accessible by the power receiving host via the host interface are provided. When a communication request command is received from the power transmission device, the mode shifts to a communication mode in which communication between hosts is performed. In this way, it is possible to realize appropriate data communication between the power transmission side host and the power reception side host by effectively utilizing contactless power transmission.

  In the present invention, the control unit may accept a communication request by the communication request command after an authentication process between the power transmission device and the power reception device is completed and normal power transmission is started.

  In this way, the authentication process is completed, and the communication request is accepted after the power transmission side is appropriate and the compatibility between the power transmission side and the power reception side is confirmed, so proper data communication is realized. it can.

  In the present invention, the register unit includes a command register in which a command issued by the power receiving host is written, and the control unit receives an interrupt command for a communication request to the power transmitting host from the power receiving host. When the command register is written, the communication mode may be entered.

  In this way, it is possible to shift to the communication mode even in response to a communication request from the power receiving host.

  In the present invention, the load may include a battery, the register unit may include a status register, and the status register may include a bit for the power receiving host to confirm the state of charge of the battery.

  This makes it possible for the power receiving host to check the state of charge of the battery by effectively utilizing the register unit provided for communication between hosts.

  In the present invention, the register unit includes an interrupt register, and the interrupt register has a bit for notifying the power receiving host of the reception of a command when the command issued by the power transmitting host is received. May be.

  In this way, the power receiving host can perform other processes until a command reception notification is received, so that the processing load on the power receiving host can be reduced.

  The present invention also relates to a power reception device including any of the power reception control devices described above and a power reception unit that converts an induced voltage of the secondary coil into a DC voltage.

  The present invention also relates to an electronic device including the power receiving device described above and a load to which power is supplied by the power receiving device.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

1. Electronic Device FIG. 1A shows an example of an electronic device to which the contactless power transmission method of this embodiment is applied. A charger 500 (cradle) which is one of electronic devices has a power transmission device 10. A mobile phone 510 that is one of the electronic devices includes a power receiving device 40. The mobile phone 510 includes a display unit 512 such as an LCD, an operation unit 514 including buttons and the like, a microphone 516 (sound input unit), a speaker 518 (sound output unit), and an antenna 520.

  Electric power is supplied to the charger 500 via the AC adapter 502, and this electric power is transmitted from the power transmitting device 10 to the power receiving device 40 by contactless power transmission. Thereby, the battery of the mobile phone 510 can be charged or the device in the mobile phone 510 can be operated.

  Note that the electronic apparatus to which this embodiment is applied is not limited to the mobile phone 510. For example, the present invention can be applied to various electronic devices such as wristwatches, cordless telephones, shavers, electric toothbrushes, wrist computers, handy terminals, portable information terminals, electric bicycles, and IC cards.

  As schematically shown in FIG. 1B, power transmission from the power transmission device 10 to the power reception device 40 is performed on the primary coil L1 (power transmission coil) provided on the power transmission device 10 side and on the power reception device 40 side. This is realized by electromagnetically coupling the secondary coil L2 (power receiving coil) formed to form a power transmission transformer. Thereby, non-contact power transmission becomes possible.

  In FIG. 1B, the primary coil L1 and the secondary coil L2 are, for example, air-core planar coils formed by winding a coil wire spirally on a plane. However, the coil of the present embodiment is not limited to this, and any shape, structure, or the like may be used as long as the primary coil L1 and the secondary coil L2 can be electromagnetically coupled to transmit power.

  For example, in FIG. 1C, the primary coil L1 is formed by winding a coil wire around the X-axis around the magnetic core in a spiral shape. The same applies to the secondary coil L2 provided in the mobile phone 510. In this embodiment, the present invention can also be applied to a coil as shown in FIG. In the case of FIG. 1 (C), as the primary coil L1 and the secondary coil L2, in addition to the coil wound around the X axis, a coil wound around the Y axis may be combined. .

2. Configuration FIG. 2 shows a configuration example of the power transmission device 10, the power transmission control device 20, the power reception device 40, and the power reception control device 50 of the present embodiment. A power transmission-side electronic device such as the charger 500 of FIG. 1A includes the power transmission device 10 of FIG. 2 and the power transmission-side host 2. The power receiving side electronic device such as the mobile phone 510 may include the power receiving device 40, the load 90 (main load), and the power receiving side host 4. These hosts (host processors) 2 and 4 can be realized by, for example, a CPU, an application processor, an ASIC circuit, and the like, and perform various processes such as an overall control process of electronic devices on the power transmission side and the power reception side. 2, for example, the primary coil L1 and the secondary coil L2 are electromagnetically coupled to transmit power from the power transmitting apparatus 10 to the power receiving apparatus 40 and supply power to the load 90. A power transmission (contactless power transmission) system is realized.

  The power transmission device 10 (power transmission module, primary module) can include a primary coil L1, a power transmission unit 12, and a power transmission control device 20. Note that the power transmission device 10 and the power transmission control device 20 are not limited to the configuration in FIG. 2, and some of the components are omitted, other components (for example, a waveform monitor circuit) are added, or the connection relationship is changed. Various modifications such as these are possible. For example, the power transmission unit 12 may be built in the power transmission control device 20.

  The primary coil L1 (power transmission side coil) is electromagnetically coupled to the secondary coil L2 (power reception side coil) to form a power transmission transformer. For example, when power transmission is necessary, as shown in FIGS. 1A and 1B, a mobile phone 510 is placed on the charger 500 so that the magnetic flux of the primary coil L1 passes through the secondary coil L2. To make sure On the other hand, when power transmission is unnecessary, the charger 500 and the mobile phone 510 are physically separated so that the magnetic flux of the primary coil L1 does not pass through the secondary coil L2.

  The power transmission unit 12 generates an AC voltage having a predetermined frequency during power transmission, and generates an AC voltage having a different frequency according to data during data transfer, and supplies the AC voltage to the primary coil L1. The power transmission unit 12 includes at least a first power transmission driver that drives one end of the primary coil L1, a second power transmission driver that drives the other end of the primary coil L1, and a resonance circuit together with the primary coil L1. One capacitor can be included. Each of the first and second power transmission drivers included in the power transmission unit 12 is an inverter circuit (buffer circuit) configured by, for example, a power MOS transistor, and is controlled by the power transmission control device 20.

  In FIG. 2, data communication from the power transmission side to the power reception side is realized by frequency modulation, and data communication from the power reception side to the power transmission side is realized by load modulation.

  Specifically, as illustrated in FIG. 3A, for example, when the data “1” is transmitted to the power receiving side, the power transmission unit 12 generates an alternating voltage of the frequency f1 and stores the data “0”. In the case of transmission, an AC voltage having a frequency f2 is generated. The detection circuit 59 on the power receiving side detects the change in the frequency, thereby discriminating data “1” and “0”. Thereby, data communication by frequency modulation from the power transmission side to the power reception side is realized.

  On the other hand, the load modulation unit 46 on the power receiving side variably changes the load on the power receiving side according to the data to be transmitted, and changes the signal waveform of the induced voltage of the primary coil L1 as shown in FIG. . For example, when data “1” is transmitted to the power transmission side, the power reception side is set to a high load state, and when data “0” is transmitted, the power reception side is set to a low load state. Then, the load state detection circuit 30 on the power transmission side detects data “1” and “0” by detecting the change in the load state on the power reception side. Thereby, data communication by load modulation from the power receiving side to the power transmission side is realized.

  In FIGS. 3A and 3B, data communication from the power transmission side to the power reception side is realized by frequency modulation, and data communication from the power reception side to the power transmission side is realized by load modulation. Alternatively, other modulation schemes or other schemes may be employed.

  The power transmission control device 20 is a device that performs various controls of the power transmission device 10, and can be realized by an integrated circuit device (IC), a microcomputer, and a program thereof. The power transmission control device 20 can include a control unit 22, a register unit 23, a host I / F (interface) 27, and a load state detection circuit 30. It should be noted that modifications such as omitting some of these components (for example, a load state detection circuit) or adding other components are possible.

  The control unit 22 (power transmission side) controls the power transmission control device 20 and the power transmission device 10. The control unit 22 can be realized by an ASIC circuit such as a gate array, or can be realized by a microcomputer and a program operating on the microcomputer. The control unit 22 controls power transmission using the power transmission unit 12, controls the register unit 23, and controls the load state detection circuit 30. Specifically, various sequence controls and determination processes necessary for power transmission, load state detection (data detection, foreign object detection, removal detection, etc.), frequency modulation, and the like are performed.

  The control unit 22 includes a power transmission sequence control unit 100, a transmission control unit 102, a reception control unit 104, a detection determination unit 106, and a periodic authentication determination unit 108. The power transmission sequence control unit 100 performs sequence control for power transmission (normal power transmission, temporary power transmission) of contactless power transmission. The transmission control unit 102 controls processing for transmitting data to the power receiving side, for example, by frequency modulation. The reception control unit 104 controls processing for receiving data from the power receiving side, for example, by load demodulation. When the load state detection circuit 30 detects the load state on the power receiving side, the detection determination unit 106 performs detection determination such as data detection, foreign object detection, and removal detection based on the detection information. The periodic authentication determination unit 108 performs a determination process as to whether or not appropriate periodic authentication has been performed, for example, when the power receiving side performs periodic authentication after the start of normal power transmission.

  The register unit 23 (storage unit) can be accessed (written and read) by the host 2 on the power transmission side via the host I / F 27, and can be realized by, for example, a RAM or a D flip-flop. The register unit 23 includes an information register 110, a status register 112, a command register 114, an interrupt register 116, and a data register 118. Information stored in the register unit 23 (for example, information stored in the information register 110) may be stored in a non-volatile memory such as a flash memory or a mask ROM.

  The information register 110 is a register for storing information such as transmission conditions and communication conditions for contactless power transmission. For example, parameters of drive frequency and drive voltage, parameters (threshold values) for detecting the load state on the power receiving side, and the like are stored. The status register 112 is a register for the host 2 to check various states such as a power transmission state and a communication state. The command register 114 is a register for the host 2 to write various commands. The interrupt register 116 is a register for various interrupts, and includes, for example, a register for setting enable / disable of each interrupt and a register for notifying the host 2 of the interrupt factor. The data register 118 is a register for buffering transmission data and reception data.

  The host I / F 27 is an interface for communicating with the host 2 on the power transmission side. In FIG. 2, communication is realized by I2C (Inter Integrated Circuit). Here, the host 2 is a CPU or the like mounted on an electronic device (charger) on the power transmission side.

  I2C is a communication method for exchanging data between a plurality of devices arranged at a short distance in the same board or the like. Two devices, SDA (serial data) and SCL (serial clock), are used between the plurality of devices. These signal lines are shared as a bus for communication. Specifically, communication is realized by setting one device as a master (host) and bus-connecting a plurality of devices as slaves thereto. Further, the slave side can interrupt the master using XINT (external Interrupt). Alternatively, an interrupt request can be made from the I2C bus. The communication method between the host and the host I / F is not limited to I2C, and may be a communication method based on the same idea as I2C, or a communication method of a normal serial interface or parallel interface.

  The load state detection circuit 30 (waveform detection circuit) detects the load state on the power receiving side (power receiving device or foreign object). This detection of the load state can be realized by detecting the waveform change of the induced voltage signal (coil end signal) of the primary coil L1. For example, when the load state (load current) on the power receiving side (secondary side) changes, the waveform of the induced voltage signal changes. The load state detection circuit 30 detects such a change in waveform and outputs a detection result (detection result information) to the control unit 22. The control unit 22 determines the load state (load fluctuation, load level) on the power receiving side (secondary side) based on the load state detection information in the load state detection circuit 30.

  The power reception device 40 (power reception module, secondary module) can include a secondary coil L2, a power reception unit 42, a load modulation unit 46, a power supply control unit 48, and a power reception control device 50. Note that the power reception device 40 and the power reception control device 50 are not limited to the configuration in FIG. 2, and some of the components (for example, the load modulation unit) are omitted, other components are added, or the connection relationship is changed. Various modifications such as these are possible. For example, any one of the power reception unit 42, the load modulation unit 46, and the power supply control unit 48 may be incorporated in the power reception control device 50.

  The power receiving unit 42 converts the AC induced voltage of the secondary coil L2 into a DC voltage. This conversion can be realized by a rectifier circuit included in the power receiving unit 42.

  The load modulation unit 46 performs load modulation processing. Specifically, when data is transmitted from the power receiving side to the power transmitting side, the load at the load modulation unit 46 (secondary side) is variably changed according to the data to be transmitted, as shown in FIG. The signal waveform of the induced voltage of the primary coil L1 is changed.

  The power supply control unit 48 controls power supply to the load 90. That is, the power supply to the load 90 is turned on or off. Specifically, the level of the DC voltage from the power receiving unit 42 (rectifier circuit) is adjusted, a power supply voltage is generated, supplied to the load 90, and the battery 94 of the load 90 is charged. Note that the load 90 may not include the battery 94.

  The power reception control device 50 is a device that performs various controls of the power reception device 40, and can be realized by an integrated circuit device (IC), a microcomputer, and a program thereof. The power reception control device 50 can operate with a power supply voltage generated from the induced voltage of the secondary coil L2. The power reception control device 50 can include a control unit 52, a register unit 53, a host I / F 57, and a detection circuit 59. It should be noted that modifications such as omitting some of these components (for example, a detection circuit) or adding other components are possible.

  The control unit 52 (power reception side) controls the power reception control device 50 and the power reception device 40. The control unit 52 can be realized by an ASIC circuit such as a gate array, or can be realized by a microcomputer and a program operating on the microcomputer. The control unit 52 controls the load modulation unit 46 and the power supply control unit 48 and controls the register unit 53. Specifically, various sequence control and determination processes necessary for position detection, frequency detection, load modulation, full charge detection, and the like are performed.

  The control unit 52 includes a power reception sequence control unit 120, a transmission control unit 122, a reception control unit 124, a detection determination unit 126, and a periodic authentication control unit 128. The power reception sequence control unit 120 performs sequence control for power reception of contactless power transmission. The transmission control unit 122 controls processing for transmitting data to the power transmission side, for example, by load modulation. The reception control unit 124 controls processing for receiving data from the power transmission side, for example, by frequency demodulation. When the detection circuit 59 performs position detection or frequency detection, the detection determination unit 126 performs detection determination based on the detection information. The periodic authentication control unit 128 controls periodic authentication performed after the start of normal power transmission. For example, in order to detect a take-up state due to a so-called foreign object, the load state on the power receiving side is changed periodically (intermittently) after the start of normal power transmission.

  The register unit 53 (storage unit) can be accessed by the host 4 on the power receiving side via the host I / F 57, and can be realized by, for example, a RAM or a D flip-flop. The register unit 53 includes an information register 130, a status register 132, a command register 134, an interrupt register 136, and a data register 138. Information stored in the register unit 53 (for example, information stored in the information register 130) may be stored in a nonvolatile memory such as a flash memory or a mask ROM. The functions of these registers are almost the same as the registers on the power transmission side, and thus description thereof is omitted.

  The host I / F 57 is an interface for performing communication with the host 4 on the power receiving side through, for example, I2C. Here, the host 4 is a CPU, an application processor, or the like mounted on the electronic device on the power receiving side. The detection circuit 59 detects the positional relationship between the primary coil L1 and the secondary coil L2, and detects the coil drive frequency at the time of data transmission from the power transmission side to the power reception side.

  As shown in FIG. 2, in this embodiment, the host I / Fs 27 and 57 are provided on the power transmission side and the power reception side, thereby enabling communication between the hosts 2 and 4 on the power transmission side and the power reception side. That is, in the conventional contactless power transmission system, only ID authentication information can be communicated between the power transmission side and the power reception side. On the other hand, according to the configuration of FIG. 2, for example, application data can be communicated between a power transmission side device such as a charger and a power reception side device such as a mobile phone using contactless power transmission. It becomes possible. Therefore, it is possible to communicate data between devices by effectively using the charging period and the like, so that the convenience for the user can be greatly improved.

  Specifically, in FIG. 2, it is assumed that a communication request command for requesting communication between the host 2 on the power transmission side and the host 4 on the power reception side is written into the register unit 23 by the host 2 via the host I / F 27. To do. In this case, the power transmission-side control unit 22 shifts to a communication mode in which communication is performed between the hosts 2 and 4 and transmits the communication request command to the power receiving device 40. For example, the operation mode (sequence) on the power transmission side is shifted to a communication mode for performing communication sequence processing, and a communication request command (packet) is transmitted to the power reception side by non-contact power transmission (inter-coil communication).

  On the other hand, when receiving a communication request command for requesting communication between the hosts 2 and 4 from the power transmission device 10, the control unit 52 on the power receiving side shifts to the communication mode. For example, when a communication request command is transmitted from the power transmission side, reception of the command is notified to the host 4 and the operation mode on the power reception side also shifts to the communication mode. As a result, communication between the hosts 2 and 4 becomes possible.

  In this case, the control unit 22 on the power transmission side accepts a communication request by a communication request command after the authentication process (negotiation or the like) between the power transmission side and the power reception side ends and normal power transmission starts. For example, after temporary power transmission is completed and normal power transmission is started, a communication request command issued by the host 2 is accepted and the communication mode is entered.

  Further, the control unit 52 on the power receiving side also accepts a communication request by a communication request command after the authentication process is completed and normal power transmission is started. That is, when a communication request command issued by the host 2 is received after normal power transmission is started, the communication request command is accepted and the communication mode is entered.

  In this way, the authentication process is completed, and the communication request can be accepted after the power transmission side and the power reception side are appropriate, and the compatibility between the power transmission side and the power reception side is confirmed. Data communication can be realized. Moreover, since data can be communicated using the normal power transmission period (charging period) effectively, user convenience can be improved.

  Here, examples of the communication request command include an OUT transfer command and an IN transfer command. The OUT transfer command is a command for requesting data transfer from the host 2 on the power transmission side to the host 4 on the power reception side. When the OUT transfer command is written in the command register 114 of the register unit 23, the control unit 22 transmits the OUT transfer command to the power receiving device 40. That is, an OUT transfer command issued by the host 2 is transmitted. Next, after confirming that an ACK command is returned from the power receiving side, data transfer commands (DATA0, DATA1) for instructing data transfer are written in the command register 114, and corresponding data is written in the data register 118. The data transfer command and data are transmitted to the power receiving device 40. That is, the data transfer command issued by the host 2 and the data from the host 2 are transmitted to the power receiving apparatus 40.

  On the other hand, the IN transfer command is a command for requesting data transfer from the power receiving side host 4 to the power transmitting side host 2. When the IN transfer command is written in the command register 114, the control unit 22 transmits the IN transfer command to the power receiving device 40. Next, when a data transfer command and data are received from the power receiving device 40, the received data is written into the data register 118. Further, the host 2 is notified using the interrupt register 116 that the data transfer command has been received.

  In addition, when the control unit 22 shifts to the communication mode, the control unit 22 determines at least one of the transmission condition for contactless power transmission and the communication condition between the power transmission side and the power reception side for a communication mode different from the normal power transmission condition. Switch to the condition. For example, when normal power transmission starts, contactless power transmission is performed under transmission conditions for normal power transmission. When the normal power transmission mode (charge mode) is switched to the communication mode after the start of normal power transmission, the transmission conditions and communication conditions for normal power transmission are switched to the transmission conditions and communication conditions for the communication mode. The communication conditions include, for example, a communication method (pulse width detection method, current detection method, amplitude detection method, etc.) and communication parameters (frequency modulation frequency, load modulation threshold value, etc.).

  Specifically, when the mode is shifted to the communication mode, the driving frequency (f1, f2) of the primary coil L1 is switched to the driving frequency for the communication mode. Alternatively, the drive voltage (VF) of the primary coil L1 may be switched to the drive voltage for the communication mode. Also, a load state detection parameter (threshold value) for data detection or foreign object detection may be switched to a communication mode parameter.

  That is, in the normal power transmission mode (charging mode), for example, transmission conditions and communication conditions that can realize power transmission with the highest transmission efficiency are set. On the other hand, in the communication mode, it is not necessary to increase the transmission efficiency of power transmission, and it is desirable to set transmission conditions and communication conditions that do not cause data transfer errors.

  Therefore, in the present embodiment, in the communication mode, switching is made to transmission conditions and communication conditions that prioritize communication reliability over transmission efficiency of power transmission. For example, the drive frequency is lowered or the drive voltage is lowered. Alternatively, the threshold value which is a communication parameter is changed, or the communication method is changed to another method. By doing so, data transfer errors and the like are reduced, and communication reliability can be improved.

  Note that the communication condition and the transmission condition for the communication mode can be the communication condition and the transmission condition in the temporary power transmission period before the start of normal power transmission, for example. That is, since commands (communication interrupt request, full charge detection, recharge confirmation command, etc.) are communicated during the normal power transmission period, communication is performed using the communication condition / transmission condition information received from the power receiving side. On the other hand, in the communication mode in which application data is communicated, the power supply to the load 90 can be stopped, so there is no need to use the communication condition / transmission condition information received from the power receiving side, and a default that enables safer and more reliable communication Use the initial communication condition and transmission condition information of the setting. That is, in the communication mode, it is used for communication conditions and transmission conditions in a temporary power transmission period that prioritizes communication reliability over transmission efficiency of power transmission.

  As shown in FIG. 2, the register unit 23 includes a status register 112, and the status register 112 includes a bit (register) for the host 2 to confirm the power transmission state of contactless power transmission. For example, as will be described later, it has a bit for confirming (notifying) that the primary coil L1 is driven and in a power transmission state, and a bit for confirming a power transmission error. Specifically, the status register 112 has a bit for the host 2 to confirm the charging state of the battery 94 on the power receiving side. For example, it has a bit for confirming that the battery 94 on the power receiving side is fully charged and has shifted to the full charging mode, and a bit for confirming that the state of the sequence on the power transmitting side is the charging phase. By providing such a bit, the host 2 can effectively check the power transmission state of the contactless power transmission, the charging state of the battery 94, etc. by effectively using the register unit 23 provided for the communication between the hosts. Thus, more intelligent control can be realized.

  The register unit 23 has an interrupt register 116. When the host 4 on the power receiving side issues a command and receives the command, the interrupt register 116 notifies the host 2 on the power transmitting side when the command is received. Have a bit for. For example, when a data transfer command (DATA0, DATA1), a communication interrupt command (INT), or a handshake command (ACK, NAK) is received, a bit for notifying the host 2 of the reception is provided. In this way, the host 2 can perform other processes until such an interrupt notification is received, so that the processing load on the host 2 can be reduced.

  The interrupt register 116 has a bit for notifying the host 2 of the start of charging of the battery 94. If such a bit is provided, the host 2 can grasp the charging start timing, and various control at the application level can be realized based on the grasped timing.

  The control unit 22 also shifts to the communication mode when receiving an interrupt command for a communication request issued by the host 4 on the power receiving side. Specifically, when the host 4 issues an interrupt command for a communication request, the reception of this command is notified to the host 2 by the interrupt register 116, and the control unit 22 shifts to the communication mode. By doing so, it becomes possible to shift to the communication mode not only by a communication request from the host 2 on the power transmission side but also by a communication request from the host 4 on the power reception side. Therefore, it is possible to make a communication request from the power receiving side to the power transmission side at a desired timing, and to communicate desired data between the hosts 2 and 4.

  The power-receiving-side register unit 53 also includes a command register 134 into which a command issued by the power-receiving-side host 4 is written. Then, when an interrupt command (INT) for a communication request to the power transmission side host 2 is written in the command register 134 by the power reception side host 4, the power reception side control unit 52 shifts to the communication mode.

  The power-receiving-side register unit 53 includes a status register 132, and the status register 132 includes a bit for the power-receiving-side host 4 to confirm the charging state of the battery 94. For example, it has a bit for confirming that the battery 94 is in a fully charged state and has shifted to the fully charged mode, and a bit for confirming that the state of the sequence on the power receiving side is the charging phase. By providing such a bit, the host 4 can effectively check the charging state of the battery 94 by effectively using the register unit 53 provided for communication between hosts, and more intelligent charging control and the like. Can be realized.

3. Operation Next, the operation of the present embodiment will be described with reference to FIGS. 2 and 4A to 6C.

  First, as illustrated in FIG. 4A, the power transmission device 10 starts temporary power transmission (position detection power transmission) before starting normal power transmission. With this temporary power transmission, a power supply voltage is supplied to the power receiving device 40 and the power receiving device 40 is powered on. And the power receiving apparatus 40 determines whether the positional relationship of the primary coil L1 and the secondary coil L2 is appropriate, for example. Specifically, it is determined whether or not the positional relationship between the primary coil L1 and the secondary coil L2 is as shown in FIG. 1B, for example.

  As shown in FIG. 4B, when it is determined that the positional relationship between L1 and L2 is appropriate, authentication processing is performed while maintaining the provisional transmission conditions between the power transmission side and the power reception side. Specifically, for example, a negotiation process and a setup process as described later are performed. Through these processes, various information such as transmission conditions and communication conditions are set in the information registers 110 and 130.

  When the authentication process between the power transmission side and the power reception side is properly completed, for example, a start frame is transmitted from the power reception side to the power transmission side. As a result, as shown in FIG. 4C, the power transmission side starts normal power transmission to the power receiving side, and charging of the battery 94 of the load 90 or the like starts.

  Thus, when normal power transmission starts, a communication request from the power transmission side host 2 is accepted. For example, in FIG. 5A, the host 2 on the power transmission side issues an OUT transfer communication request command, and this communication request command is written to the register unit 23 (command register) via the host I / F 27. As a result, the power transmission side shifts to the communication mode and switches the transmission condition and communication condition from the normal power transmission to the communication mode. Also, the periodic authentication judgment process is turned off.

  The issued OUT transfer communication request command (command packet) is transmitted from the power transmission side (primary side) to the power reception side (secondary side) by non-contact power transmission (frequency modulation). When receiving the communication request command, the power receiving side shifts to the communication mode, turns off the power supply transistor (TB2), and turns off the power supply to the load 90. Also, the periodic authentication transmission process is turned off. Thus, by turning off the power supply to the load 90, it is possible to prevent the fluctuation of the load 90 from adversely affecting the load modulation for data communication in the communication mode.

  The power receiving side notifies the reception side host 4 of the reception of the communication request command using the register unit 53. Thereby, the host 4 can know the communication request for OUT transfer from the power transmission side.

  Next, as shown in FIG. 5B, the power transmission side host 2 sends a data transfer command and corresponding data to the host I in order to execute OUT transfer for transferring data from the power transmission side to the power reception side. Write to the register unit 23 (command register, data register) via / F27. Then, the data transfer command and data are transmitted from the power transmission side to the power reception side by non-contact power transmission (frequency modulation).

  When receiving the data transfer command, the power receiving side notifies the host 4 of the reception of the data transfer command using the register unit 53 (interrupt register). Thereby, the host 4 can know that the power receiving side has received the data from the power transmitting side.

  Then, as shown in FIG. 5C, the host 4 reads the data written in the register unit 53 (data register) via the host I / F 57. As a result, OUT transfer in which data from the host 2 is transferred to the host 4 using non-contact power transmission is realized.

  On the other hand, in FIG. 6A, the power transmission side host 2 issues an IN transfer communication request command, and this communication request command is written to the register unit 23 (command register) via the host I / F 27. Thereby, the power transmission side shifts to the communication mode.

  The issued IN transfer communication request command is transmitted from the power transmission side to the power reception side by non-contact power transmission. When receiving the communication request command, the power receiving side shifts to the communication mode. The reception of the communication request command is notified to the host 4 on the power receiving side using the register unit 53. As a result, the host 4 can know the IN transfer communication request from the power transmission side.

  Then, as shown in FIG. 6B, the host 4 sends a data transfer command and corresponding data via the host I / F 57 to execute IN transfer for transferring data from the power receiving side to the power transmitting side. Write to the register unit 53. Then, the data transfer command and data are transmitted from the power receiving side to the power transmitting side by non-contact power transmission (load modulation).

  Upon receiving the data transfer command, the power transmission side notifies the power transmission side host 2 of the reception of the data transfer command using the register unit 23. Thereby, the host 2 can know that the power transmission side has received the data from the power reception side.

  Then, as shown in FIG. 6C, the host 2 reads the data written in the register unit 23 via the host I / F 27. Thereby, IN transfer is realized in which data from the host 4 is transferred to the host 2 using contactless power transmission.

  FIG. 7 is an example of a signal waveform for more specifically explaining the OUT transfer described in FIGS. 5 (A) to 5 (C).

  In A1 of FIG. 7, the power transmission side transmits an OUT transfer command, which is a communication request command, to the power reception side using contactless power transmission (frequency modulation) (see FIG. 5A). A6h and CRC8 are a start code and a CRC code, respectively.

  When receiving the OUT transfer command, the power receiving side transmits an ACK command, which is a handshake command corresponding to the OUT transfer command, to the power transmitting side, as indicated by A2 in FIG. With this ACK command, the host 2 on the power transmission side can confirm that the host 4 on the power reception side has properly received the OUT transfer command.

  Next, as indicated by A3 in FIG. 7, the power transmission side that has received the ACK command transmits a data transfer command (DATA0) and corresponding data to the power reception side (see FIG. 5B). Then, as shown in A4, the power receiving side transmits an ACK command corresponding to the data transfer command to the power transmitting side. With this ACK command, the host 2 on the power transmission side can confirm that the host 4 on the power reception side has properly received the data.

  By repeating the transfer process as described above until the necessary number of data is reached, OUT transfer in which data of a desired number of data is transmitted from the host 2 on the power transmission side to the host 4 on the power reception side is realized.

  In A3 and A5 in FIG. 7, the DATA0 data transfer command and the DATA1 data transfer command are transferred while being toggled. Thereby, the reliability of data transfer can be improved. In FIG. 7, the power transmission side may issue the OUT transfer command only once. Specifically, when the power transmission side transmits an OUT transfer command and the power reception side transmits an ACK command in response thereto, the power transmission side transmits a data transfer command (DATA0) and data. When the power receiving side transmits an ACK command, the power transmitting side transmits a data transfer command (DATA1) and data without transmitting an OUT transfer command, and this is repeated until the necessary number of data is reached.

  FIG. 8 is an example of a signal waveform for more specifically explaining the IN transfer described in FIGS. 6 (A) to 6 (C).

  In B1 of FIG. 8, the power transmission side transmits an IN transfer command, which is a communication request command, to the power reception side using contactless power transmission (frequency modulation) (see FIG. 6A).

  When receiving the IN transfer command, the power receiving side transmits a data transfer command (DATA0) and corresponding data to the power transmitting side as shown in B2 (see FIG. 6B). Then, as shown in B3, the power transmission side transmits an ACK command for the data transfer command to the power reception side. With this ACK command, the host 4 on the power receiving side can confirm that the host 2 on the power transmitting side has properly received the data.

  By repeating the transfer process as described above until the required number of data is reached, IN transfer for transmitting data of a desired number of data from the power receiving side host 4 to the power transmitting side host 2 is realized.

  Although A2 and A4 in FIG. 7 and B3 in FIG. 8 perform handshaking by the ACK command, OUT transfer and IN transfer may be realized without performing such handshaking.

4). Register Map Next, the register map of this embodiment will be described. FIG. 9 is an example of a register map of the register unit 23 on the power transmission side.

  SoftReset is a bit for the host 2 to instruct a soft reset, and OUTxIN is a bit for switching between a transmission buffer and a reception buffer.

  The status register 112 is a register for confirming each state of power transmission (charging), standby, and communication by the host 2 on the power transmission side reading it.

  For example, PriBusy of the status register 112 becomes 1 immediately after the host 2 on the power transmission side (primary side) makes a command issue request, and becomes 0 when transmission of the command packet by inter-coil communication (contactless power transmission) is completed. It is a bit to become. When communication from the power transmission side to the power reception side is started, it is confirmed that this bit is 0.

  SecReq is a bit that becomes 1 immediately after receiving a command from the power receiving side (secondary side) by inter-coil communication, and returns to 0 after the reception is completed. When communication from the power receiving side to the power transmitting side is started, it is confirmed that this bit is 0. ChgErr is a bit that is set to 1 when it is determined that an error has occurred during power transmission to the power receiving side due to failure detection of the power transmission driver, temperature abnormality detection, or low voltage detection. It is necessary to reset to recover from the error.

  FullChg is a bit that is 1 immediately after the full charge detection command (save command) is received from the power receiving side and shifts to the full charge mode, and returns to 0 after the shift to the recharge confirmation mode. ComSel is a bit indicating that the sequencer on the power transmission side is in the charging mode (normal power transmission mode) and is ready for branching by command selection. DrvOn is a bit indicating that the coil is driven by the power transmission side and is in a power transmission state.

  SetUp is a bit that becomes 1 after the power transmission side shifts to a setup process described later. Since this bit returns to 0 in the communication mode, it indicates whether the current transmission condition or communication parameter is for normal power transmission (for charging) or communication mode. NegoTran is a bit that becomes 1 after the power transmission side shifts to a negotiation process described later.

  Among the bits of the status register 112, for example, ChgErr, Fullchg, ComSel, DrvOn are bits for the host 2 to check the power transmission state of contactless power transmission, among which, for example, Fullchg, ComSel are the charging state of the battery 94 It becomes a bit to confirm.

  The command register 114 is a register for transmitting a command packet from the power transmission side to the power reception side when the host 2 writes a command to this register in the command branch phase. When a command is written to this register, the periodic authentication check is masked, and the power transmission conditions and communication conditions are switched from normal power transmission (for charging) to communication mode (communication enabled conditions, negotiation conditions), and the command is transmitted. Is done. At the end of command transmission, the bit of this register returns to 0, so that the host 2 can confirm the end of transmission.

  For example, ReChgSend of the command register 114 is a bit for transmitting a packet of a normal power transmission start command (charging start command) to the power receiving side by inter-coil communication. For example, transmission is executed by setting this bit to 1. Similarly, ACKSend, Data1Send, Data0Send, OutSend, and InSend are bits for transmitting ACK command, DATA1 command, DATA0 command, OUT transfer command, and IN transfer command packets to the power receiving side through inter-coil communication, respectively.

  The interrupt register 116 includes an interrupt enable register and an interrupt status register. The interrupt enable register is a register for permitting / prohibiting the assertion of notification of each interrupt, and by setting a corresponding bit to 1, an interrupt to the host 2 is permitted. The interrupt status register is a register indicating the status of each interrupt. When a status in which an interrupt is permitted by the interrupt enable register is generated, the status becomes an interrupt factor.

  EnINTComRcv of the interrupt enable register is a bit for permitting an interrupt when receiving an INT command (interrupt command) from the power receiving side. Similarly, EnDt1ComRcv, EnDt0ComRcv, EnSTALLComRcv, EnNAKComRcv, and EnACKComRcv are bits for permitting an interrupt when receiving a DATA1, COM0 command, STALL command, NAK command, and ACK command, respectively. EnErrComRcv is a bit for permitting an interrupt when an error occurs in the received command packet, and EnReChgOn is a bit for permitting an interrupt at the timing of normal power transmission start (charging start).

  INTComRcv of the interrupt status register is a bit that becomes 1 when an INT command is received from the power receiving side. Similarly, Dt1ComRcv, Dt0ComRcv, STALLComRcv, NAKComRcv, and ACKComRcv are bits that become 1 when a DATA1 command, DATA0 command, STALL command, NAK command, and ACK command are received, respectively. ErrComRcv is a bit that is set to 1 when an error occurs in the received command packet (frame), and ReChgOn is a bit that is set to 1 in synchronization with the normal transmission start (charging start) timing.

  Of the bits of the interrupt register 116 described above, for example, INTComRcv, Dt1ComRcv, Dt0ComRcv, STALLComRcv, NAKComRcv, and ACKComRcv are bits for notifying the host 2 on the power transmission side of reception of a command from the power reception side. ReChgOn is a bit for notifying the power transmission side host 2 of the start of charging of the battery 94, and the power transmission side host 2 can know the charging start timing of the battery 94 by the notification by this bit.

  When the power transmission side host 2 issues an OUT transfer command and an IN transfer command, which are communication request commands, and writes them in the register unit 23, the power transmission side shifts to the communication mode. Also, when an INT command, which is an interrupt command for a communication request issued by the power receiving side host 4, is received, INTComRcv becomes 1, thereby causing the power transmitting side to shift to the communication mode.

  The data register 118 has a data buffer composed of bits of TranBuf_0 to TranBuf_7. Then, at the time of data transmission, following the DATA0 and DATA1 commands that are data transfer commands, the data set in advance in the data register 118 is transmitted in order of TranBuf_0 to TranBuf_7. On the other hand, at the time of data reception, following the DATA0 and DATA1 commands, the received data is stored in the data register 118 in the order of TranBuf_0 to TranBuf_7.

  Note that RcvMsg serves as a reception buffer for message data of the INT command for inter-coil communication. By preliminarily determining the contents of the message data of the INT command between the hosts, it is possible to convey the contents (data type, etc.) of the interrupt request on the power receiving side.

  FIG. 10 is an example of a register map of the register unit 53 on the power receiving side.

  The status register 132 is a register for confirming each state of power transmission (charging), standby, and communication by the host 4 on the power receiving side reading the data.

  For example, SecBusy of the status register 132 is a bit that becomes 1 immediately after the host 4 on the power receiving side (secondary side) makes a command issuance request and becomes 0 when transmission of the command packet by inter-coil communication is completed. However, after issuing the INT command, this bit is held at 1 until an ACK command is returned from the power transmission side.

  PriReq becomes 1 immediately after receiving the IN / OUT transfer command from the power transmission side (primary side) by inter-coil communication, and a series of data transfer ends, and the power transmission side returns a response command of the normal power transmission start command. This bit returns to 0.

  ComSel is a bit indicating that the sequencer on the power receiving side is in the charging mode (normal power transmission mode) and is ready for branching by command selection. FullChg is a bit indicating that the battery 94 is in a fully charged state and a full charge detection command (save command) can be issued.

  Of the bits of the status register 132 described above, for example, ComSel and Fullchg are bits for the host 4 to confirm the charging state of the battery 94.

  The command register 134 is a register for transmitting a command packet from the power receiving side to the power transmitting side when the host 4 writes a command to this register in the command branching phase. When a command is written in this register, the power transmission condition and communication condition are switched from normal power transmission to communication mode, and the command is transmitted. When the command transmission ends, the bit of this register returns to 0, so that the host 4 can confirm the end of transmission.

  For example, STALLSend, NAKSend, ACKSend, Data1Send, Data0Send, INTSend, and STOPSend of the command register 134 are STALL command, NAK command, ACK command, DATA1 command, DATA0 command, INT command (and message data), STOP, respectively, through inter-coil communication. It is a bit for transmitting a command packet to the power transmission side. For example, transmission is executed by setting these bits to 1.

  The interrupt register 136 includes an interrupt enable register and an interrupt status register. The interrupt enable registers EnReChgRcv, EnDt1ComRcv, EnDt0ComRcv, EnINComRcv, EnOUTComRcv, EnACKComRcv are respectively a RECHG command (normal transmission start command), DATA1 command, DATA0 command, IN transfer command, OUT transfer command, ACK command It is a bit to allow ENICutXOn is a bit for permitting an interrupt to the rise of the output of ICUTX, which is a load reduction instruction signal in periodic authentication, and EnReChgOn is permitted to interrupt at the timing of normal power transmission start (charging start) It is a bit to do.

  ReChgRcv, Dt1ComRcv, Dt0ComRcv, INComRcv, OUTComRcv, and ACKComRcv of the interrupt status register are bits that are set to 1 when a RECHG command, DATA1 command, DATA0 command, IN transfer command, OUT transfer command, and ACK command are received, respectively. ICutXOn is a bit that becomes 1 when the output of ICUTX rises, and ReChgOn is a bit that becomes 1 in synchronization with the timing of normal power transmission start (charging start).

  Of the bits of the interrupt register 136 described above, for example, ReChgRcv, Dt1ComRcv, Dt0ComRcv, INComRcv, OUTComRcv, and ACKComRcv are bits for notifying the host 4 on the power receiving side of reception of a command from the host 2 on the power transmitting side. ReChgOn is a bit for notifying the power receiving side host 4 of the start of charging of the battery 94, and the power receiving side host 4 can know the charging start timing of the battery 94 by the notification by this bit.

  When an OUT transfer command and an IN transfer command that are communication request commands issued by the power transmission side host 2 are received, OUTComRcv and INComRcv are set to 1, and the power receiving side shifts to the communication mode. Also, when the host 4 on the power receiving side issues an INT command that is an interrupt command for a communication request, the power receiving side shifts to the communication mode.

  The data register 138 has a data buffer composed of bits of TranBuf_0 to TranBuf_7. When data is transmitted, data set in advance in the data register 138 is transmitted in the order of TransBuf_0 to TranBuf_7 following the DATA0 and DATA1 commands that are data transfer commands. On the other hand, at the time of data reception, following the DATA0 and DATA1 commands, the received data is stored in the data register 138 in the order of TranBuf_0 to TranBuf_7. Note that SendMsg serves as a buffer for storing message data of the INT command for inter-coil communication.

5. Next, communication between the host and the host I / F will be described with reference to FIGS. 11A and 11B. FIG. 11A and FIG. 11B are examples when the I2C communication method is adopted.

  FIG. 11A shows an example in which the master (host) writes data to the slave (power transmission control device, power reception control device). As indicated by C1 in FIG. 11A, when the SCL is at the H level, the master changes the SDA from the H level to the L level, thereby starting communication. Then, the master designates the address of the slave as shown at C2, and the SDA is set to L level at the last bit as shown at C3 to notify that the write operation is being performed.

  When the slave address is addressed to the slave, the slave returns ACK to the master by setting SDA to the L level as shown in C4. Then, as shown at C5, the master designates the address of the register to be written. When the slave returns ACK as indicated by C6, the master sends write data as register data to be written to the register address as indicated by C7, and the slave returns ACK as indicated by C8. Then, as shown in C9, when the SCL is at the H level, the master changes the SDA from the L level to the H level, thereby terminating the communication.

  FIG. 11B shows an example in which the master reads data from the slave. After the start indicated by D1 in FIG. 11B, the master designates the slave address as indicated by D2, and when the slave returns ACK as indicated by D3, the master designates the register address as indicated by D4. .

  Next, when the slave returns ACK as shown in D5, the master restarts as shown in D6. When the master designates a register address as shown in D7, the slave sets SDA to L level and returns ACK as shown in D8, and then sends read data as register data as shown in D9. When the slave returns NAK as shown in D10, the master ends the communication as shown in D11.

6). Processing sequence of non-contact power transmission Now, when non-contact power transmission becomes widespread, it is expected that various types of secondary coils on the power receiving side will be put on the market. That is, since the outer shape and size of an electric device such as a mobile phone on the power receiving side are various, the outer shape and size of the secondary coil incorporated in the power receiving device of the electronic device are also varied accordingly. In addition, since the amount of electric power (wattage) and output voltage for contactless power transmission required by each electronic device are various, the inductance of the secondary coil and the like vary accordingly.

  On the other hand, in non-contact power transmission, even if the shapes and sizes of the primary coil and the secondary coil are not completely adapted, a situation occurs in which power is transmitted. In this regard, in charging using a wired cable, such a situation can be prevented by devising the shape of the connector of the cable and the like, but it is difficult to apply such a devising in non-contact power transmission.

  At present, contactless power transmission is realized by an individual method for each manufacturer.

  However, in order to promote the spread of contactless power transmission and to ensure the safety associated therewith, it is desirable to realize a highly versatile contactless power transmission processing sequence.

  FIG. 12 schematically shows a processing sequence of contactless power transmission realized by the present embodiment.

  In this processing sequence, after the reset state, the process proceeds to the standby phase. Here, in the reset state, various flags held by the power transmission side (primary) and the power reception side (secondary) are cleared. Here, the flag represents the state of the power transmission device or the power reception device (power transmission state, full charge state, recharge confirmation state, etc.), and is held in the register unit of these devices.

  In the standby phase, the power transmission side (primary) holds the final state when the power reception side (secondary) is stopped (when power transmission is stopped). For example, when full charge of the battery is detected, the power transmission side and the power reception side shift to a standby phase after full charge detection. In this case, since it is necessary to detect a decrease in the battery voltage and perform recharging, the power transmission side stores that the cause of power transmission stop is full charge detection. Specifically, the recharge confirmation flag is maintained in the set state without being cleared, and it is periodically confirmed whether or not recharge is necessary.

  In the standby phase, since power transmission from the power transmission side to the power reception side stops, the power reception side is stopped without being supplied with power supply voltage, but the power transmission side is in operation with power supply voltage supplied. . In this way, the power receiving side stops the operation in the standby phase, so that the power consumption can be reduced.At this time, the power transmission side holds the flags of various states without clearing, so that the power transmission side has the flag after the standby phase. Various processes can be executed using.

  The power transmission side and the power reception side shift to the negotiation phase after the standby phase. In this negotiation phase, a negotiation process is performed in which standard / coil / system matching is confirmed, safety information is exchanged, and the like. Specifically, the power transmission side and the power reception side exchange information on standard / coil / system information, and confirm whether the standard / coil / system is compatible with each other. In addition, for example, the power receiving side transmits safety threshold information for foreign object detection or the like to the power transmission side, and performs safety information exchange. In this negotiation process, whether or not information communication is possible between the power transmission side and the power reception side, whether or not the communicated information is valid, and whether or not the load state on the power reception side is appropriate (foreign matter non-detection) Will be confirmed.

  In the negotiation process, when it is determined that the standards / coils / systems do not match, a foreign object is detected, removal of a device is detected, or a time-out error occurs, the process proceeds to a reset state, and various flags are cleared. On the other hand, in the case of a communication error or the like, for example, the process proceeds to the standby phase, and the flag is not cleared.

  The power transmission side and the power reception side shift to the setup phase after the negotiation phase. In this setup phase, a setup process is executed in which setup information such as information on the corresponding function and setting information for each application is transferred. For example, based on the result of the negotiation process, the authentication process is performed and the transmission condition is specified. Specifically, when the power receiving side transmits transmission condition information such as the coil driving voltage and driving frequency to the power transmission side, the power transmission side performs normal power transmission such as the coil driving voltage and driving frequency based on the received transmission condition information. Set the transmission conditions for. In addition, this setup process also exchanges information about supported functions and exchanges of setting information that differs for each higher-level application. Specifically, threshold information for detecting the load state on the power receiving side after the start of normal power transmission (for example, threshold information for data communication / foreign object detection), and is issued / executed by the power transmitting side and the power receiving side in the command phase Information exchange regarding additional command functions such as the types of possible commands, communication functions, and periodic authentication functions is executed in this setup process. This makes it possible to exchange different setting information according to the application such as the type of electronic device (mobile phone, audio device, etc.) and model.

  In the setup process, when the removal of the device is detected or a time-out error occurs, a transition is made to the reset state. On the other hand, in the case of a communication error or the like, the process proceeds to a standby phase.

  The power transmission side and the power reception side shift to the command phase after the setup phase. In this command phase, command processing is performed based on information obtained by the setup processing. That is, a corresponding command (a command that has been confirmed by the setup process to be compatible) is issued or executed. As commands executed in the command processing, for example, a normal power transmission (charge) start command, a full charge detection (notification) command, a recharge confirmation command, a communication command, a power reception side interrupt command, a power transmission stop request command, and the like can be considered.

  For example, when preparation for normal power transmission is completed by negotiation processing and setup processing, the power transmission side sends (issues) a normal power transmission (charging) start command to the power receiving side, and when the power receiving side that receives it sends a response command to the power transmission side, Power transmission starts. When full charge is detected on the power receiving side after the start of normal power transmission, the power receiving side transmits a full charge detection command to the power transmission side.

  When it is not necessary to continue transmission as in this full charge detection, the process proceeds to a standby phase after full charge detection. Then, again through the negotiation process and the setup process, the power transmitting side transmits a recharge confirmation command to the power receiving side. As a result, the power receiving side checks the battery voltage to determine whether recharging is necessary. If recharge is required, the recharge confirmation flag is reset, the process proceeds to the negotiation phase, and after the authentication process and the setup process are performed, the power transmission side issues a normal power transmission start command. Resumed. On the other hand, when recharge is not necessary, the recharge confirmation flag is maintained in the set state, and the process returns to the standby phase after full charge is detected.

  In the command processing, when any abnormality is detected, foreign matter is detected, or removal is detected, the reset state is entered.

  The processing sequence of this embodiment will be described more specifically with reference to FIG. In the standby phase after the removal detection indicated by F1, for example, landing detection is performed once every k1 seconds. When the landing (installation) of the electronic device is detected as indicated by F2, negotiation processing and setup processing are executed. Then, as shown in F3, when the negotiation process and the setup process are normally completed and a normal power transmission start command is issued in the command process, normal power transmission is started, and charging of the electronic device is started. When full charge is detected as indicated by F4, the LED of the electronic device is turned off, and the process proceeds to a standby phase after detection of full charge as indicated by F5.

  In the standby phase after full charge detection, for example, removal detection is performed once every k3 seconds and recharge confirmation is performed once every k3 × j seconds. When the removal of the electronic device is detected in the standby phase after the detection of full charge as indicated by F6, the process proceeds to the standby phase after the detection of removal. On the other hand, in the standby phase after full charge detection, if it is determined that recharging is necessary by recharging confirmation as shown in F7, negotiation processing and setup processing are performed, normal power transmission is resumed, Recharging is performed. If removal of an electronic device is detected during normal power transmission as indicated by F8, the process proceeds to a standby phase after removal detection.

  The system information transferred in the negotiation phase is information indicating a load state detection method on the power transmission side or the power reception side. Here, the load state detection method includes a pulse width detection method (phase detection method), a current detection method, a peak voltage detection method, or a combination of these methods. The system information is information indicating which of these methods is adopted by the power transmission side and the power reception side.

  The foreign object threshold is safety threshold information. This foreign object threshold value is stored on the power receiving side, for example, and is transmitted from the power receiving side to the power transmission side before starting normal power transmission. The power transmission side performs primary foreign object detection, which is foreign object detection before starting normal power transmission, based on the foreign object threshold value. For example, when the load state on the power receiving side is detected by the pulse width detection method, the threshold value of the pulse width count value is transmitted from the power receiving side to the power transmission side as the foreign object threshold value. Based on the threshold value, primary foreign matter detection is performed by a pulse width detection method. As described above, in the present embodiment, the threshold information for detecting the load state on the power receiving side before the start of normal power transmission is transmitted from the power receiving side to the power transmission side in the negotiation process. On the other hand, threshold information for detecting the load state on the power receiving side after the start of normal power transmission is transmitted from the power receiving side to the power transmission side in the setup process, for example.

  According to the processing sequence of the present embodiment described above, for example, determination of compatibility of standards / coils / systems and minimum information exchange for safety are performed in the negotiation processing. In this negotiation process, it is determined that communication is possible and the validity of the communication information, and the suitability of the load state on the power receiving side is determined.

  In the setup process, transmission conditions necessary for normal power transmission are set. For example, the driving voltage and driving frequency of the coil are set. In addition, the transfer of threshold information for detecting the load state after the start of normal power transmission, the exchange of information about additional support functions, and the exchange of setting information required for each higher-level application are performed in the setup process. The

  Then, after undergoing such a setup process and negotiation process, the process proceeds to the command phase and the command process is performed. That is, the command processing that is confirmed to be compatible in the negotiation processing and the setup processing is performed in the command processing.

  In this way, the minimum information exchange necessary for ensuring the compatibility and safety of the system is executed in the negotiation process, and the exchange of setup information that differs for each application is executed in the setup process. Therefore, when the power transmission side and the power reception side are not compatible, since they are excluded in the negotiation process, it is not necessary to transfer setup information with a large amount of information. Thus, only a minimum amount of information needs to be transferred in the negotiation process, and the amount of transfer information can be reduced. Therefore, the negotiation phase can be completed in a short period of time, and the process can be made efficient.

  In addition, each device on the power transmission side and the power reception side can perform the minimum contactless power transmission by the negotiation process, and the function expansion for each device can be realized by exchanging setup information. Therefore, each device performs the minimum setting necessary for the contactless power transmission system by the negotiation process, and the system can be optimized by the setup process, so that a flexible system construction can be realized.

  In addition, the power transmission side can receive non-contact power transmission and foreign object detection simply by receiving threshold information and system information from the power receiving side and setting the received threshold information and system information. Can be simplified. In this case, the power receiving side transmits appropriate combination of coil information and threshold information to the power transmission side, so that proper and safe contactless power transmission can be realized.

7). Detailed Configuration Example FIG. 14 shows a detailed configuration example of the present embodiment. In the following description, the components described in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The waveform monitor circuit 14 generates an induced voltage signal PHIN for waveform monitoring based on the coil end signal CSG of the primary coil L1. For example, the coil end signal CSG which is an induced voltage signal of the primary coil L1 exceeds the maximum rated voltage of the IC of the power transmission control device 20, or becomes a negative voltage. The waveform monitor circuit 14 receives such a coil end signal CSG, generates an induced voltage signal PHIN for waveform monitoring, which is a signal that can be detected by the load state detection circuit 30 of the power transmission control device 20, and performs power transmission control. For example, output to the waveform monitor terminal of the apparatus 20. The display unit 16 displays various states of the contactless power transmission system (during power transmission, ID authentication, etc.) using colors, images, and the like.

  The oscillation circuit 24 generates a primary side clock. The drive clock generation circuit 25 generates a drive clock that defines the drive frequency. The driver control circuit 26 generates a control signal having a desired frequency based on the drive clock from the drive clock generation circuit 25, the frequency setting signal from the control unit 22, and the like, and the first and second power transmissions of the power transmission unit 12. It outputs to a driver and controls the 1st, 2nd power transmission driver.

  The load state detection circuit 30 shapes the induced voltage signal PHIN to generate a waveform shaping signal. For example, a square wave (rectangular wave) waveform shaping signal (pulse signal) that becomes active (eg, H level) when the signal PHIN exceeds a given threshold voltage is generated. The load state detection circuit 30 detects the pulse width information (pulse width period) of the waveform shaping signal based on the waveform shaping signal and the drive clock. Specifically, the pulse width information of the induced voltage signal PHIN is detected by receiving the waveform shaping signal and the drive clock from the drive clock generation circuit 25 and detecting the pulse width information of the waveform shaping signal.

  The load state detection circuit 30 is not limited to the pulse width detection method (phase detection method), and various methods such as a current detection method and a peak voltage detection method can be employed.

  The control unit 22 (power transmission control device) determines the load state (load fluctuation, load level) on the power receiving side (secondary side) based on the detection result in the load state detection circuit 30. For example, the control unit 22 determines the load state on the power receiving side based on the pulse width information detected by the load state detection circuit 30 (pulse width detection circuit), for example, data (load) detection, foreign object (metal) detection, Perform removal (detachment) detection. That is, the pulse width period, which is the pulse width information of the induced voltage signal, changes according to the change in the load state on the power receiving side. The control unit 22 can detect the load fluctuation on the power receiving side based on the pulse width period (a count value obtained by measuring the pulse width period).

  The power receiving unit 42 converts the AC induced voltage of the secondary coil L2 into a DC voltage. This conversion is performed by a rectifier circuit 43 included in the power receiving unit 42.

  The load modulation unit 46 performs load modulation processing. Specifically, when desired data is transmitted from the power receiving device 40 to the power transmitting device 10, the load at the load modulation unit 46 (secondary side) is variably changed according to the transmission data, and the primary coil L1 The signal waveform of the induced voltage is changed. For this purpose, the load modulation unit 46 includes a resistor RB3 and a transistor TB3 (N-type CMOS transistor) provided in series between the nodes NB3 and NB4. The transistor TB3 is ON / OFF controlled by a signal P3Q from the control unit 52 of the power reception control device 50. When performing load modulation by controlling on / off of the transistor TB3, the transistor TB2 of the power supply control unit 48 is turned off, and the load 90 is not electrically connected to the power receiving device 40.

  The power supply control unit 48 controls power supply to the load 90. The regulator 49 adjusts the voltage level of the DC voltage VDC obtained by the conversion in the rectifier circuit 43 to generate the power supply voltage VD5 (for example, 5V). The power reception control device 50 operates by being supplied with the power supply voltage VD5, for example.

  The transistor TB2 (P-type CMOS transistor, power supply transistor) is controlled by a signal P1Q from the control unit 52 of the power reception control device 50. Specifically, the transistor TB2 is turned off during the negotiation process and the setup process, and is turned on after the normal power transmission is started.

  The position detection circuit 56 determines whether the positional relationship between the primary coil L1 and the secondary coil L2 is appropriate. The oscillation circuit 58 generates a secondary clock. The frequency detection circuit 60 detects the frequency (f1, f2) of the signal CCMPI. The full charge detection circuit 62 detects whether or not the battery 94 (secondary battery) of the load 90 is in a fully charged state (charged state).

  The load 90 can include a charge control device 92 that performs charge control of the battery 94 and the like. The charge control device 92 (charge control IC) can be realized by an integrated circuit device or the like. Note that, like a smart battery, the battery 94 itself may have the function of the charging control device 92.

8). Detailed Operation Example Next, details of the operation on the power transmission side and the power reception side will be described with reference to the flowcharts of FIGS. In FIG. 15, the left column is a power transmission side processing flow, and the right column is a power reception side processing flow.

  As shown in FIG. 15, when the power transmission side is turned on and powered on, the power transmission side performs temporary power transmission before starting normal power transmission (step S2) after, for example, a wait of k1 seconds (step S1). This temporary power transmission is temporary power transmission for landing detection, position detection, and the like. That is, power transmission is performed to detect whether or not the electronic device is placed on the charger and, if so, whether or not the electronic device is placed at an appropriate position. The drive frequency in this temporary power transmission (the frequency of the drive clock from the drive clock generation circuit) is set to f1, for example.

  Due to temporary power transmission from the power transmission side, the power receiving side is powered on (step S22), and the power reception control device 50 is reset to power on. Then, the power reception control device 50 sets the signal P1Q to the H level, thereby turning off the transistor TB2 (power supply transistor) of the power supply control unit 48 (step S23), and disconnecting the electrical connection with the load 90. Is done.

  Next, the power receiving side uses the position detection circuit 56 to determine the positional relationship (position level) between the primary coil L1 and the secondary coil L2, and acquires position level information that is positional relationship information (step S24).

  The power receiving side generates a negotiation frame and transmits it to the power transmission side regardless of whether the positional relationship is appropriate (step S25). Specifically, a negotiation frame is transmitted by load modulation. This negotiation frame includes, for example, standard information stored in the register unit 53 on the power receiving side, matching codes such as coil information, system information (load state detection method), threshold information (threshold for detecting load state), and the like Includes hard information. Further, the position level information (position relation information) acquired in step S24 is added to the negotiation frame.

  When the power transmission side receives the negotiation frame (step S4), it verifies the negotiation frame (step S5). Specifically, it is determined whether or not the standard / coil / system information stored in the power transmission-side register unit 23 and the standard / coil / system information received from the power receiving side are a combination of applicable ranges. Further, the positional relationship between the primary coil L1 and the secondary coil L2 is also determined based on the position level information added to the negotiation frame. If it is determined that the frame is an appropriate negotiation frame, foreign object detection is performed (step S6).

  Specifically, the power transmission side sets the drive frequency to the foreign object detection frequency f3. Based on the threshold information (safety threshold information) received from the power receiving side, primary foreign matter detection before the start of normal power transmission is performed, and it is determined whether or not the load state on the power receiving side is appropriate. For example, the foreign object detection enable signal is activated to instruct the load state detection circuit 30 to start foreign object detection. This foreign object detection is realized, for example, by comparing load state detection information (pulse width information) from the load state detection circuit 30 with a load state detection threshold value (META) received from the power receiving side. When the foreign object detection period ends, the power transmission side returns the drive frequency to the frequency f1.

  If the power transmission side determines that the negotiation frame is not appropriate in step S5 or determines that a foreign object has been detected in step S6, the power transmission stops and returns to step S1.

  Next, the power transmission side creates a negotiation frame and transmits it to the power reception side (step S7). This negotiation frame includes, for example, standard information, coil information, and system information stored in the register unit 23 on the power transmission side.

  When the power receiving side receives the negotiation frame (step S26), it verifies the negotiation frame (step S27). Specifically, it is determined whether or not the standard / coil / system information stored in the power receiving side register unit 53 and the standard / coil / system information received from the power transmission side are a combination of the applicable ranges. Further, the positional relationship between the primary coil L1 and the secondary coil L2 is determined again, and position level information is acquired. When it is determined that the frame is an appropriate negotiation frame, a setup frame is generated and transmitted to the power transmission side (step S28). The setup frame includes communication condition information, transmission condition information, corresponding function information, and the like and position level information. Here, the communication condition information includes a communication method and communication parameters. The transmission condition information is the driving voltage and driving frequency of the primary coil. Corresponding function information is information representing functions added to each application. If the negotiation frame is not appropriate, the process returns to step S21.

  When receiving the setup frame (step S8), the power transmission side verifies the setup frame (step S9). If the setup frame from the power receiving side is appropriate, a power transmission side setup frame is created and transmitted to the power receiving side (step S10). On the other hand, if the setup frame is not appropriate, power transmission is stopped and the process returns to step S1.

  When receiving the setup frame (step S29), the power receiving side verifies the setup frame (step S30). If the setup frame is appropriate, a start frame is created and transmitted to the power transmission side (step S31). On the other hand, if the setup frame is not appropriate, the process returns to step S21.

  When the start frame is transmitted, the power transmission side and the power reception side shift to a command branch. That is, command determination is performed, and the process branches to command processing according to various flags.

  FIG. 16 is a flowchart showing processing on the power transmission side after command branching. As shown in FIG. 16, the power transmission side has no other command (communication request, interrupt, power transmission stop, recharge confirmation flag = 1, etc.) requiring priority processing in the command branch of step S41. Transmits a normal power transmission (charging) start command to the power receiving side (step S42). When the response command for the normal power transmission start command is received from the power receiving side, the positional relationship between the primary coil L1 and the secondary coil L2 is confirmed based on the position level information added to the received response command (step S43). . Then, the transmission condition and the communication condition are switched to the conditions for normal power transmission (step S44). Specifically, the transmission conditions and communication conditions set in the setup process are switched. Then, periodic authentication is turned on (step S45), and normal power transmission is started (step S46).

  The power transmission side detects a takeover state due to a large-sized metal foreign object or the like in a periodic authentication period by periodic load modulation after normal power transmission is started (step S47). Also, removal detection and foreign object detection are performed (steps S48 and S49). When hijacking is detected in periodic authentication, removal or foreign matter is detected, power transmission is stopped and the process returns to step S1.

  Next, the power transmission side determines whether or not a power transmission stop command (STOP command) has been received from the host 4 on the power receiving side (step S50). Further, it is determined whether or not an interrupt command (INT command) from the power receiving side host 4 has been received (step S51). Further, it is determined whether or not there is a host communication request (OUT / IN transfer command) from the power transmission side host 2 (step S52).

  If there is no reception or request for these commands, the power transmission side determines whether or not a full charge detection command (save frame) has been received from the power reception side (step S53). Returns to step S47. On the other hand, when received, the periodic authentication is turned off and power transmission is stopped (steps S54 and S55). Then, the process proceeds to a standby phase after full charge detection (step S56).

  In the standby phase after detection of full charge, for example, removal is detected once every k3 seconds (step S57). When removal is detected, the recharge confirmation flag is reset to 0 (step S60), power transmission is stopped, and the process returns to step S1.

  In the standby phase after full charge detection, for example, once every k3 × j seconds, recharge is confirmed, the recharge confirmation flag is set to 1 (steps S58 and S59), power transmission is stopped, and the process proceeds to step S1. Return.

  When the recharge confirmation flag is set to 1 in step S59, negotiation processing and setup processing are performed after returning to step S1. And in the command branch of step S41, since the recharge confirmation flag is 1, it transfers to the process of recharge confirmation mode.

  Specifically, the power transmission side transmits a recharge confirmation command to the power reception side (step S61). When a response command to the recharge confirmation command is received from the power receiving side (step S62), it is determined whether or not the battery 94 needs to be recharged based on the battery voltage check result received together with the response command (step S62). S63). If it is determined that recharging is necessary, power transmission for recharging confirmation (temporary power transmission) is stopped (step S64), a recharging confirmation flag is set to 0, and the process returns to step S1. On the other hand, if it is determined that recharging is not necessary, power transmission for recharging confirmation is stopped (step S65), and the process returns from the recharging confirmation mode to the standby mode after detecting full charge (steps S56 to S58). .

  If the power transmission side determines that a power transmission stop command or interrupt command has been received in steps S50 and S51, or if it is determined that a communication request has been received from the host 2 in step S52, the transmission conditions or communication conditions for contactless power transmission Is switched from normal power transmission to communication mode conditions (temporary power transmission conditions) (step S66). For example, the drive frequency and the drive voltage are switched, and the threshold parameter for detecting the load state on the power receiving side is switched. Then, the process proceeds to a command branch in step S41.

  For example, if it is determined in step S52 that there is a communication request from the host 2 on the power transmission side, the process branches to the communication mode processing by the host request in the command branch of step S41. In the communication mode by the host request, an OUT transfer command or an IN transfer command, which is a communication request command issued by the host 2, is transmitted to the power receiving side (step S67). Then, after waiting for a response from the power receiving side, it is determined whether or not a timeout has occurred (step S68), and in the case of timeout, the process returns to step S41. On the other hand, if it is not a timeout, an arbitrary communication sequence based on the agreement between the hosts 2 and 4 is executed (step S69). That is, command transmission / reception, data transmission / reception, and handshake transmission / reception as described in FIGS. Then, it is determined whether or not the required number of data has been reached (step S70). If the required number of data has been reached, a normal power transmission start command (charging start command) is set in the command register 114 (step S71), and step Return to S41. This makes it possible to return from the communication mode to the normal power transmission mode (charging mode).

  If it is determined in step S51 that an interrupt command (INT command) has been received from the power receiving side, the process branches to the communication mode processing by the power receiving side interrupt command in the command branch of step S41. In the communication mode based on the interrupt command from the power receiving side, it is first determined whether or not communication is possible in the current situation (step S72). If communication is not possible, the process proceeds to step S71. On the other hand, if communication is possible, an ACK command is set in the command register 114 and transmitted to the power receiving side (steps S73 and S74). And it transfers to the process of the communication mode of step S68-S70.

  If it is determined in step S50 that a power transmission stop command (STOP command) has been received from the power receiving side, the process branches to power transmission stop command processing in the command branch of step S41. Then, power transmission to the power receiving side is stopped (step S76), and for example, removal is detected every k4 seconds (steps S77 and S78). And when removal is detected, it transfers to step S60 and returns to step S1. In addition, also when there exists timeout of the L time timer for measuring continuous charging time (step S75), it transfers to step S76 and stops power transmission.

  As described above, in this embodiment, the power transmission side receives a communication request from the power transmission side host 2 (step S52) or receives an interrupt command from the power reception side host 4 (step S51). Then, switching to the conditions for the communication mode is performed (step S66). And it transfers to the communication mode in which the communication sequence process of step S68-S70 is performed, and when communication mode is complete | finished, a normal power transmission start command is issued (step S71) and normal power transmission is restarted.

  FIG. 17 is a flowchart showing processing on the power receiving side after command branching. As shown in FIG. 17, the power receiving side has no other command (communication request, interrupt, power transmission stop, etc.) requiring priority processing in the command branch of step S81, and the normal power transmission start command from the power transmission side. Is received (step S82), the positional relationship between the primary coil L1 and the secondary coil L2 is determined again, and position level information that is positional relationship information is acquired (step S83). Then, the response command to which the position level information is added is transmitted to the power transmission side (step S84).

  After transmitting the response command, the power receiving side turns on the transistor TB2 of the power supply control unit 48 (step S85), and starts supplying power to the load 90. Further, periodic authentication is turned on, and periodic load modulation is performed (step S86). Specifically, the transistor TB3 of the load modulation unit 46 is turned on / off in a predetermined pattern during the periodic authentication period.

  Next, the power receiving side determines whether or not there is a power transmission stop request (STOP command) from the host 4 on the power receiving side (step S87). Further, it is determined whether or not there is an interrupt request (INT command) from the host 4 on the power receiving side (step S88). Further, it is determined whether or not a communication request command (OUT / IN transfer command) from the power transmission side host 2 has been received (step S89).

  When the power receiving side does not receive these requests or commands, the power receiving side detects whether or not the battery 94 is fully charged (step S90). If full charge is not detected, the process returns to step S87. On the other hand, when full charge is detected, the transistor TB2 is turned off (step S91), and power supply to the load 90 is stopped. Also, the periodic authentication is turned off (step S92). Then, a full charge detection command (save frame) for notifying the detection of full charge is transmitted to the power transmission side (step S93). After a wait period of k5 seconds (step S94), the process returns to step S93 and the process is repeated.

  When the power transmission side starts power transmission for recharging confirmation (temporary power transmission), the power receiving side is reset to power-on, and performs negotiation processing and setup processing. When the recharge confirmation command (see step S61) transmitted by the power transmission side is received, the process proceeds to the recharge confirmation mode in the command branch of step S81.

  Specifically, the power receiving side checks the battery voltage (step S95), and transmits a response command to the recharge confirmation command and a check result of the battery voltage to the power transmission side (step S96). The power is turned off when the power transmission for recharging confirmation stops.

  When the power receiving side determines that there has been a power transmission stop request or an interrupt request from the host 4 in steps S87 and S88, or if it determines that a communication request command has been received in step S89, the power receiving transistor TB2 is set. In addition to turning off, periodic authentication is also turned off (step S97). Then, the transmission condition and the communication condition are switched to the conditions for the communication mode (step S98), and the process proceeds to the command branch of step S81.

  For example, if it is determined in step S89 that a communication request command (OUT / IN transfer command) has been received from the power transmission side, the process branches to a communication mode process in response to a communication request from the power transmission side in the command branch of step S81. . Then, an arbitrary communication sequence based on the agreement between the hosts 2 and 4 is executed (step S102). That is, command transmission / reception, data transmission / reception, and handshake transmission / reception as described in FIGS. Then, it is determined whether or not the required number of data has been reached (step S103). If the required number of data has been reached, it is determined whether or not the normal power transmission start command (see step S71) transmitted by the power transmission side has been received (step S71). Step S104). If received, the process proceeds to step S83, and the communication mode returns to the normal power transmission mode (charging mode).

  If it is determined in step S88 that an interrupt request has been received from the host 4 on the power receiving side, the process branches to a communication mode process in response to the interrupt request on the power receiving side in the command branch in step S81. In the communication mode based on the interrupt request on the power receiving side, a communication request command (INT command) is transmitted to the power transmission side (step S99). Then, it is determined whether or not a normal power transmission start command has been received from the power transmission side (step S100). If not received, it is determined whether or not an ACK command (see step S74) has been received (step S101). If received, the process proceeds to the communication mode processing of steps S102 and S103.

  If it is determined in step S87 that there is a power transmission stop request from the host 4 on the power receiving side, the process branches to a process according to a power transmission stop request in the command branch of step S81. Then, a power transmission stop command is transmitted to the power transmission side (step S105), and the power is turned off when the power transmission is stopped.

  As described above, in this embodiment, when the power receiving side receives a communication request command from the host 2 on the power transmitting side (step S89) or when there is an interrupt request from the host 4 on the power receiving side, The process shifts to a communication mode in which communication sequence processing such as S103 is performed. And after communication mode is complete | finished, it returns to normal power transmission mode.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. All combinations of the present embodiment and the modified examples are also included in the scope of the present invention. The configuration and operation of the power transmission control device, power transmission device, power reception control device, power reception device, data transfer method, command setting method, communication processing, host interface processing, load state detection method, etc. are also described in this embodiment. The present invention is not limited to this, and various modifications can be made.

1A, 1B, and 1C are explanatory diagrams of contactless power transmission. 1 is a configuration example of a power transmission device, a power transmission control device, a power reception device, and a power reception control device of the present embodiment. 3A and 3B are explanatory diagrams of data transfer by frequency modulation and load modulation. FIG. 4A to FIG. 4C are explanatory diagrams of the operation of this embodiment. FIG. 5A to FIG. 5C are explanatory diagrams of the operation of this embodiment. 6A to 6C are explanatory diagrams of the operation of the present embodiment. 7 is a signal waveform example illustrating OUT transfer. The signal waveform example explaining IN transfer. An example of a register map on the power transmission side. An example of a register map on the power receiving side. 11A and 11B are diagrams illustrating an example of a communication method between the host and the host I / F. Explanatory drawing of the processing sequence of non-contact electric power transmission. Explanatory drawing of the processing sequence of non-contact electric power transmission. The detailed structural example of the power transmission apparatus of this embodiment, a power transmission control apparatus, a power receiving apparatus, and a power reception control apparatus. The flowchart for demonstrating the operation | movement of this embodiment. The flowchart for demonstrating the operation | movement of this embodiment. The flowchart for demonstrating the operation | movement of this embodiment.

Explanation of symbols

L1 primary coil, L2 secondary coil, 2 hosts (power transmission side), 4 hosts (power reception side),
DESCRIPTION OF SYMBOLS 10 Power transmission apparatus, 12 Power transmission part, 14 Waveform monitor circuit, 16 Display part,
20 power transmission control device, 22 control unit (power transmission side), 23 register unit, 24 oscillation circuit,
25 drive clock generation circuit, 26 driver control circuit, 27 host I / F,
30 load state detection circuit, 40 power receiving device, 42 power receiving unit, 43 rectifier circuit,
46 load modulation unit, 48 power supply control unit, 50 power reception control device, 52 control unit (power reception side), 53 register unit, 56 position detection circuit, 57 host I / F, 58 oscillation circuit,
59 detection circuit, 60 frequency detection circuit, 62 full charge detection circuit, 90 load,
92 charge control device, 94 battery, 100 power transmission sequence control unit,
102 transmission control unit, 104 reception control unit, 106 detection determination unit,
108 Periodic authentication judgment unit, 110 information register, 112 status register,
114 command register, 116 interrupt register, 118 data register,
120 power reception sequence control unit, 122 transmission control unit, 124 reception control unit,
126 detection determination unit, 128 periodic authentication control unit, 130 information register,
132 Status register, 134 Command register, 136 Interrupt register,
138 Data register

Claims (18)

  1. Provided in the power transmission device of the non-contact power transmission system that electromagnetically couples the primary coil and the secondary coil to transmit power from the power transmission device to the power reception device and supplies power to the load of the power reception device. A power transmission control device,
    A control unit for controlling the power transmission control device;
    A host interface for communicating with the power transmission side host;
    A register unit accessible by the power transmission side host via the host interface,
    The controller is
    When a communication request command for requesting communication between the power transmission side host and the power reception side host is written to the register unit by the power transmission side host via the host interface during normal power transmission , the power transmission After transitioning to a communication mode in which communication is performed between the host on the receiving side and the host on the power receiving side and transmitting the communication request command to the power receiving device to shift the power receiving device to the communication mode. Send a normal power transmission start command to the power receiving device, resume normal power transmission,
    During normal power transmission, when an interrupt command for a communication request issued by the power receiving host is received from the power receiving device, the communication mode is entered, and the normal power transmission start command is issued after the communication mode ends. And the power transmission control apparatus characterized by restarting normal power transmission .
  2. In claim 1,
    The controller is
    A power transmission control device that accepts a communication request based on the communication request command after an authentication process between the power transmission device and the power reception device is finished and normal power transmission is started.
  3. In claim 1 or 2,
    The register unit is
    A command register to which a command issued by the power transmission side host is written;
    Including a data register for buffering data,
    The controller is
    When an OUT transfer command for requesting data transfer from the power transmission side host to the power reception side host is written in the command register, the OUT transfer command is transmitted to the power receiving device,
    Next, a data transfer command for instructing data transfer is written to the command register, and when the data is written to the data register, the data transfer command and data are transmitted to the power receiving device. Control device.
  4. In any one of Claims 1 thru | or 3,
    The register unit is
    A command register to which a command issued by the power transmission side host is written;
    Including a data register for buffering data,
    The controller is
    When an IN transfer command for requesting data transfer from the power receiving host to the power transmitting host is written in the command register, the IN transfer command is transmitted to the power receiving device,
    Next, a data transfer command for instructing data transfer from the power receiving apparatus and, when receiving the data, the received data is written to the data register.
  5. In any one of Claims 1 thru | or 4,
    The controller is
    When transitioning to the communication mode, at least one of the transmission conditions for contactless power transmission and the communication conditions between the power transmission device and the power reception device is changed to a condition for the communication mode different from the condition for normal power transmission. A power transmission control device characterized by setting.
  6. In claim 5 ,
    The controller is
    A power transmission control device that switches the driving frequency or driving voltage of the primary coil to the driving frequency or driving voltage for the communication mode when the mode is shifted to the communication mode.
  7. In any one of Claims 1 thru | or 6 .
    The register unit includes a status register,
    The power transmission control device, wherein the status register includes a bit for the power transmission side host to confirm a power transmission state of contactless power transmission.
  8. In claim 7 ,
    The load includes a battery;
    The power transmission control device according to claim 1, wherein the status register includes a bit for the power transmission side host to confirm a charge state of the battery.
  9. In any one of Claims 1 thru | or 8 .
    The register unit includes an interrupt register,
    The power transmission control device, wherein the interrupt register has a bit for notifying the power transmission side host of reception of a command when the command issued by the power reception side host is received.
  10. In claim 9 ,
    The load includes a battery;
    The power transmission control device, wherein the interrupt register has a bit for notifying the power transmission side host of the start of charging of the battery.
  11. A power transmission control device according to any one of claims 1 to 10 ,
    And a power transmission unit that generates an AC voltage and supplies the AC voltage to the primary coil.
  12. An electronic device comprising the power transmission device according to claim 11 .
  13. Provided in the power receiving device of the non-contact power transmission system that electromagnetically couples the primary coil and the secondary coil to transmit power from the power transmitting device to the power receiving device and supply power to the load of the power receiving device. A power reception control device,
    A control unit for controlling the power reception control device;
    A host interface for communicating with the power receiving host;
    A register unit accessible by the power receiving host via the host interface,
    The register unit is
    A command register to which a command issued by the power receiving host is written;
    The controller is
    During normal power transmission, when a communication request command for requesting communication between the power transmission side host and the power reception side host is received from the power transmission device , the power supply to the load is stopped, and the power transmission side When a normal power transmission start command is received from the power transmission device after the communication mode is completed and the communication mode for performing communication between the host and the power receiving host is completed, the power supply to the load is resumed.
    During normal power transmission, when an interrupt command for a communication request to the power transmission side host is written to the command register by the power reception side host, the power supply to the load is stopped and the communication mode is entered. When the normal power transmission start command is received from the power transmission device after the communication mode ends, the power supply control device resumes the power supply to the load .
  14. In claim 13 ,
    The controller is
    A power reception control device that receives a communication request by the communication request command after normal power transmission is started after an authentication process between the power transmission device and the power reception device is completed.
  15. In claim 13 or 14 ,
    The load includes a battery;
    The register unit includes a status register,
    The power reception control device, wherein the status register includes a bit for the power receiving side host to check a charging state of the battery.
  16. In any of claims 13 to 15 ,
    The register unit includes an interrupt register,
    The power reception control device according to claim 1, wherein the interrupt register includes a bit for notifying the power reception side host of reception of a command when the command issued by the power transmission side host is received.
  17. A power reception control device according to any one of claims 13 to 16 ,
    And a power receiving unit that converts an induced voltage of the secondary coil into a DC voltage.
  18. A power receiving device according to claim 17 ,
    An electronic apparatus comprising: a load to which power is supplied by the power receiving device.
JP2008185396A 2008-07-16 2008-07-16 Power transmission control device, power transmission device, power reception control device, power reception device, and electronic device Active JP4725610B2 (en)

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